Schematic in PDF form, 1.72 MB, named TERESA20. The name carries only what looks like a project code name with no brand, model or board number, so open the file and read the title block to identify the target device. Compare any code there with the markings printed on the PCB before relying on the drawing. A schematic like this is used to trace power rails and signals, read component values and reference designators, and isolate shorts or missing voltages during repair.
The button opens the matching file on RM Schematics, or a source page if it is not catalogued there yet. The original attachment is from @alischematics. Enginerys does not host this file.
How to open a .pdf file
The standard format for schematics, block diagrams, power-sequence charts and service manuals.